nghttp2_session_callbacks_set_on_begin_headers_callback ======================================================= Synopsis -------- *#include <nghttp2/nghttp2.h>* .. function:: void nghttp2_session_callbacks_set_on_begin_headers_callback( nghttp2_session_callbacks *cbs, nghttp2_on_begin_headers_callback on_begin_headers_callback) Sets callback function invoked when the reception of header block in HEADERS or PUSH_PROMISE is started.